Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,3,2,1,2 for x=0,1,2,3,4.
A197238
Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,3,2,1,2 for x=0,1,2,3,4.
Terms
- a(0) =1a(1) =8a(2) =46a(3) =231a(4) =1221a(5) =6284a(6) =32754a(7) =170928a(8) =888997a(9) =4628482a(10) =24105642a(11) =125519823a(12) =653563458a(13) =3403159865a(14) =17720701794a(15) =92272812665a(16) =480470439059
External references
- oeis: A197238